/ Dictionary / Index A Argand diagram: Meaning and Definition of Find definitions for: Ar'gand di"agram Pronunciation: [key] — Math. Math. a Cartesian coordinate system consisting of two perpendicular axes for graphing complex numbers, the real part of a number being plotted along the horizontal axis and the imaginary part along the vertical axis. Cf. imaginary axis, real axis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Argand burner Argand lamp Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language